If you've frozen it in that inch thick disk (or worse, the ball) that I always tend to, it takes a couple of days in the fridge to unfreeze it. After that, I still like it on the counter for a couple of hours to make it easy to roll out. What you DON'T want , though, is for any of your butter to melt. Which means no hurrying it up in the microwave (I've tried, oh how I've tried and it never works).